比如说；It's important to study English well,
to study English well 作主语
To do more exercise is good for your health
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第1个回答 2009-03-21
To do more sports is good for health.
第2个回答 2009-03-21
it`s healthy to do sports.
第3个回答 2009-03-21
To do more exercises is good for your health.
